Rocklands Reservoir

Updated as of 2:59 PM 13 January 2021

Rocklands Reservoir is the largest reservoir within GWMWater’s water supply system and is located on the Glenelg River. Originally constructed to supply the Wimmera-Mallee Domestic and Stock channel system, water held by Rocklands Reservoir is now used for many different purposes. A unique feature of Rocklands Reservoir is that all entitlement holders, including the environment, are able to be supplied with water from the reservoir.

For information on Rocklands Reservoir camping restrictions please visit

General Information

Water based recreation activities are popular.
This reservoir has six special location bouys installed adjacent to each of the six main camp grounds. These assist lake users locate their position on the lake.
Toilet facilities are available. Dogs are not permitted.

Recreational Activities

Swimming, water skiing and jet skiing is permitted at Rocklands Reservoir.
Shooting of ducks during duck season is permitted.
Camping is not permitted until further notice.

Current Operating Status

Current Level 189.720 m AHD
Current Volume 84,220 ML
Percent Full 28%
Current Inflows -1,240 ML/week
24 hour Rainfall 0 mmCummulative Inflows Graph
Current Releases 70 ML/day
Current Spills 0 ML/day
Current Airspace 177,290 ML


The maximum operating level of Rocklands Reservoir has been increased to 296,000 ML to align with the current Storage Management Rules. The maximum operating level was increased from 75% to 85% of full supply level as recommended by  the Bulk and Environmental Entitlements Operation Review. 24 September 2014.
  • Levels have fallen since last report.
  • Inflows to the reservoir have decreased since last report.
  • The reservoir is not currently spilling.


Full Supply Level 195.47 m AHD
Full Supply Volume 348,300 ML
Maximum Operating Level (MOL) 194.67 m AHD
Maximum Operating Volume 296,000 ML
Spillway Length 154.53 m
Spillway Capacity 66,000 ML/day
Outlet Capacity 600 ML/day
Catchment Area 1,355 km2
Surface Area When Full 67.5 km2
Major Tributary Glenelg River
Average Annual Inflow 83,000 ML/year
Maximum Depth 17 m
Year Constructed 1953
AHD = Australian Height Datum, expressed in metres above mean sea level
ML = Megalitres